...as the urban legend goes the guy (somehow) got hold of a JATO (Jet Assist Take-Off) rocket and straped it to his car. He ended up slaming into a clif face. The police estimated the average speed as being well over 450 kph. ...I decided to give the rocket a little more power..just for fun.
However, if you want to be acurate (as well as a party pooper) you can correct this in the config file. Have fun! (Uses Vinka's Spacecraft.DLL)